I dunno. I think tech people have a tendency to assume they know for certain that they have a better solution, and their words/tone can reflect that in a way that can come off as very insulting to people who have been working in the space for literal decades.

Not everyone, and not all the time. But many people, and often enough that it's a stereotype. So I think it's worth considering, particularly when you're looking at a customer base who (by and large) really aren't used to being condescended to.

Even if you and I personally aren't offended in the slightest by what OP said on sales calls, it's possible a psychologist in the fourth decade of her career might take "Are you sure that's right?" differently than we would.